CUED Publications database

Flux vortex dynamics in type-II superconductors

Srpčič, J and Moseley, DA and Perez, F and Huang, KY and Shi, Y and Dennis, AR and Ainslie, MD and Campbell, AM and Boll, M and Cardwell, DA and Durrell, JH (2020) Flux vortex dynamics in type-II superconductors. Superconductor Science and Technology, 33. ISSN 0953-2048

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Abstract

The flux-pinning landscape in type-II superconductors determines the response of the flux line lattice to changing magnetic fields. Typically, the flux vortex behaviour is hysteretic and well described within the framework of the Bean critical-state model and its extensions. However, if the changing magnetic field does not move the flux vortices from their pinning sites, their response remains linear and reversible. The vortex displacement, then, is characterised by the Campbell penetration depth, which itself is related directly to the effective size of the pinning potential. Here, we present measurements of the Campbell penetration depth (and the effective size of the pinning potential) as a function of magnetic field in a single-grain bulk GdBa2Cu3 ALIGN="MIDDLE" ALT="$$" SRC="sustab5b53ieqn1.gif" superconductor using a pick-up coil method. Hence, the hysteretic losses, which take into account the reversible vortex movement, are established.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Materials Engineering
Div C > Engineering Design
Depositing User: Cron Job
Date Deposited: 18 Nov 2019 20:01
Last Modified: 31 Aug 2021 07:21
DOI: 10.1088/1361-6668/ab5b53